Pipe grinder



Dec. 7, 1948.

3 Sheets-Sheet 1 Filed Oct. 16, 1944 N 611 R Hall INVENTOR. BY WW HIS AGENI a 4 h mm w N a av v .w a v L I ,3 u rml NW 5 II 2 m .w N QM 0 0 m 0 0 0 nm' b v f Y T 5 a... Q

3 Q N m ,2 B\ 3 m N 3 N 7, 1948. l V HALL n 2,455,762

PIPE GRINDER Filed Oct. 16, 1944 3 Sheets-Sheet 2 011 RQHQII INVENTOR.

ygy I E 2 HIS AGENT.

6 4 4 s Q Q 4 4 5 Dec. 7, 1948. o. R. HALL 2,455,762

PIPE GRINDER Filed Oct. 16, 1944 Q I- 3 Sheets-Sheet 3 0 "c3 Q Q N V f INVENTOR.

Patented Dec. 7, 1948 UNITED s'r s PAT ENT OFFICE l PIPE criminals on a. Hall; Wichita Falls 'lex. Application October 16, 19144, Serial 15101558344 i left in a roughened condition with scales on the face of the bevel and when it is desired to weld two pieces 'of pipe together; "that have beenso cut, it is necessary to removethe scale before an lefiectivejob of welding can be accomplished.

Heretofiore it has beenthepractice to do this by hand, which is a laborious and time consuming process; and it is dimcult' to do a satisfactory scaling and surfacing job by hand. 1 i

The present invention; when used on theroughi ened ends "of "pipe, efliciently and quickly grinds them so asto give a uniform standard of work.

The primary object ofthis invention is to provide a grinder for grinding the ends of .pipe smooth without the necessity of having to take the pipe into a machine shop.

Another object of this inventionis to provide a portable grinder for grinding smooth antlbevelthat modifications" may bemade within the "scope of the invention as it claimed xwithoutdeparting from the spirit thereof. 1

In the drawingsz Fig. 1 is a top plan *viewcf the invention as installed on apiece of pipe, withparts broken away and parts shown in section to .showldeta'ils of construction. l l

Fig. 2 is a sect'ionalelevational view taken on the line 2-2-o fFig. 1 i Fig. 3 is a fragmentary elevational viewoi the motor and the dr iving means connected thereto. Fig. 41s an end view of the invention as applied to apieceofplpe. l Y i l w Fig. 5 is a sectional view taken on the line 5-5 of Fig. 2 and looking inthedirlecmon indicated by the arrows; 5 l l it s Fig. 6 is anenlar ged end View oilthe outer adjustable bearing memberof the grinder shaft, with parts shownins'ection. P l

Fig; '7 is a perspective view of the grinder guard removed from the machine 1 The grinding machine comprises 'alstationary fram generally designated .by the letter FJa-nd which iscom posed oi arcuatetmemberstl at either end thereof which are substantially semi cimular. Secured to each oi the arcuatermame members I, at spaced intervals thenearoaadare sleeves '2, with pairsof said-sleeves in axiaia'lianment. A

longitudinal bar a is secured to each of the sleeves in axial alignment, so as to hold the arcuate memhers I in. spaced longitudinal alignment. Set screws 4. threadably engage arcuate members i so as to space said arcuatemembers from pipe I, Look nuts 5 hold set screws I in adjusted position. A chain 5 is secured to a spring 1 which interconnects withan eye 8 on arcuate member 1 and ahook. dispositibned on the opposite end of arcuate member. I. to engage a link lllof the chain i when said chain is adjusted about pipeIf,

A slidable frame designated generally by the letter S is positioned to slide relative to stationary frameF The slidable frame S is composed of arcuate members I lwhich are secured to longitudinalrods l2; Arcuate members II are spaced intermediate arouate members I of the stationary The longitudinal rods l2 pass through sleeves 2 and are slidabletherein. An annular ring 13 is secured to the outer end ofislidable rods 12., as is best seen in Figs. 1 and 2.: friction member 48", preferably having a JV cross section. is positioned on a side of annular ring 13 and extends axially: outward. It is preferable to have this surface made of material formed irom rubber-and fabric composition; simi- Jam .in construction to a V -belt. This may be embedded in a shallow recess a side of ring [3 "andriveted orcemented or otherwise secured thereto. .The outer-periphery of ring l3 has a lip or annular flange extending around the outer side thereof, and which overlaps an edge of rota-table ring l4. Bearings, such as ball bearings [5, are interflt'tedbetween annular ring 13, which is :sta- Morrow, and annular ring M which is rotatable therearound. The rotatable annular ring M has a friction member 16 interfitting within a recess in theouter periphery of annular rotatable ring ll. 'This irlction member is, preferably, of V shape, but it is in inverse position tothe normal ll-shape of V-bel-t-s an-dis secured to the outer periphery of annular member 14 to preventslip- Pa l j A jshaft 1'! is journaled in bearings 18 and. ,AV belt pulley 2'0 islmounted On the shaft [1 in .to engage friction member 13. A uni- .iiersal joint 2| is positioned on the inner end of shaft H anda shaft 22 is attached thereto. The outer end of shaft .22 is iournaled bearing .23 which is positionedbetween springs 24 and 25. The bearing 23 its .slidahle within slotted guide s26 secured to thezro tatable annular ring Id... The relative positionof the outer end of shaft 22 may be changed, either sbyset screw .21 or by movement of slidable frame S relative to the stationary frame F.

A granular stone 28 is secured on the shaft 22 intermediate universal joint 2| and bearing 23, as by set screw 29, however, grinding element 28 may be moved along shaft 22 to secure proper radial adjustment of the grinding element, rela tive to the pipe P. While it is usually preferable to use a stone of granular composition, it is to be understood that for certain work, abrasive cloth or a metallic cutter element formed with cutting teeth, similar to a milling cutter, may be used. J

An ear 3!] is positioned on inner stationary arcuate member I and has a lever 3| pivoted thereto. An ear 33 is positioned on slidable ar cuate member II and has links 34 pivoted thereon and connected with lever 3 so as'to move slid able frame s relative to stationary frame F.

"within slotted guide member 26.

.:; :adjustment of screw 21 to cause an increased tension on spring 24, which will move bearing 23 This will cause the compression of spring 25, and if the bevel is an exterior bevel, it will grind a wider bevel on A motor M is positioned on one of the slidable I arcuate members II and preferably has a Vepulh ley 35 which interengages'with a frictional'member 36, which is'prefera'bly, also of V cross section and is composed of material similar to that of a V-belt, but is inversely constructed to the normalV-belt. This friction member 36 is posi tioned on a pulley 31secured tosh aft 38;; The shaft 38 is journal ed in a bearing sleeve 39 and said shaft has a pulley 40 thereon which engages with friction member l6 on annular" ring M. The sleeve bearing 39 'is positioned on to'p of standard 4| which is adapted to slide through slot 42 in a sleeve 2'. The standard 4| issecured to one of the rods l2, as by welding (Fig. 3). A handle 43 is positioned on top of frame 'F to permit the lifting of the machine from one pipe to another. A guard 44 is secured to the base of the bearing l9 and to the top of the guide 26, and is adjustably positioned over grinding element 28 to prevent injury'to the operator. A

wire brush 45 is adjustably positioned on shaft I! for cleaning the end of pipe P; The grinding element 28 is preferably formed to havea bevel on either side and a flat faceinterposed between the bevels which enables either an exterior or an interior bevel tobe ground, or the face of the pipe may be ground perfectly smooth and square on the end, as the'nature of the work indicates. In usual practice the bevels are such as. togive a normal bevel to accommodate the correct welding beads to enable the pipes to bewelded end to end. However, the'bevel may be varied to accommodate the particular use to which the pipe is to be adapted.

In the operation of the devicethe frame F is placed upona pipe P which-may be any diameter within the range of'the machine, andv the set screws 4 adjusted until the arcuate members I are spaced equidistant from pipe .P. This will, in turn, space shafts-ll and 22 diametrically across pipe P. Chains 6 are then'tightly drawn around the lower portion of the pipe P and engaged with hooks 9. The tension ofspring 1 will hold the frame in adjusted position. When the stationary frame F has beensecurely adjusted with respect to pipe P, the grinding element is adjusted along shaft 22 until the proper position is obtained. Set screw 29 then secures grinding element 28 against longitudinal movement on shaft 22. By manipulating the lever 31, grinding element 28 is brought into contact with the end of the pipe P and the motorM is then started. The pulley 35 on the motorshaft will drive pulley 31, which in turn, will drive'pulley -40-to rotate annular ring I4, towhich is secured bearings l8 and 26. This will cause shafts l'l and,22

' the'pipe. "However, the inverse is true if the bevel is to be an interior bevel. If it is desired 'to grind a narrower exterior bevel, this can be accomplished by putting an increased tension on lever 3| which will cause a compression of the spring 24- and permit shaft 22 to swing outward. The bearing 23 will permit longitudinal move ment'of shaft 22 and this bearing 23 will be rocked about its pivot point within slot of slotted guide member to permit angular divergence of Primarily the grinding of the bevel portion of the pipe is to smooth up and remove the scale from a bevel which has been out by'a cutting torch. However, it is to be understood that the unit is not restricted to this particular use, but may be used for forming a bevel in its entirety, if so desired.

It is to be understood that the size of the driving pulleys may be varied or gears may be substituted therefor: to be within the scope of the inventive intent rof the present invention, although preference is given to the present arrangement, inasmuch as the abrasive dust is not so detrimental to atfrictional element as shown, as it is to gears.

1. In a machine for surfacing the ends of pipe, an' elongated saddle'type stationary frame, means fordetachably securing said stationary frame in spaced relation around the outer periphery of a pipe and extending 'therealong, means for mounting a rotatable frame adjacentthe end of said stationary frame, means for mounting a grinding element'on said rotatable frame, means for rotating said rotatable frame; and means for imparting rotation to saidgrinding element while rotating said rotatable frame. a p

2. In a machine for grinding the ends of pipe, a stationary frame, means for detachably securing said stationary framein spaced relation to a pipe, a slidable frame'adapted to slide within said stationary frame; an annular element mounted on the outer end of said slidable frame and carrying a driving element; a second annular member, rotatably mounted on said first mentioned annular member and having a shaft journalled thereon, a driving. elementqmountedwon said shaft and secured thereto and engaging the driving element of the first mentionediannular member, a grinding'element connected with said shaft for engagement with the end of saidpipe, means for supplying power to said rotatable annular member and to said grinding element, and means for adjusting said grinding element relative to the end :of said pipe, v i I 3. In :a machine .for grinding the ends of pipe, a stationary frame, means for detachably securing saidsta'tionary frame-in spaced relation to a enemas pipe, a slidableyframe adapted to siidewithin said stationary frame, an annular element mounted on .thejouter end of said sli'd able' frame and earry: .a driving element, a secondannulak A rotatably fnounted on said flrstimention nular member and havin a shaft thereon, a drivingeiemen't un'ted on shaft and, securedthereto and engaging the, r ving element of the first mentioned annular member, a grinding element connected with said shaft for engagement with the end of said pipe, means for supplying power to said rotatable annular member and to said grinding element, means for adjusting said grinding element relative to theend of said pipe, and means for sliding said slidable frame to secure adjustment of said grinding element relative to the end of said pipe.

4. In a machine for grinding the ends of pipe, a stationary frame, means for detachably securing said stationary frame in spaced relation to a pipe, a slidable frame adapted to slide within said stationary frame, an annular element mounted on the outer end of said slidable frame and carrying a driving element, a second annular member rotatably mounted on said first mentioned annular member and having a shaft journaled thereon, a driving element mounted on said shaft and secured thereto and engaging the driving element of the first mentioned annular member, a grinding element, a shaft having said grinding element mounted thereon and connected with said first mentioned shaftfor driving said grinding element in engagement with the end of said pipe, means for supplying power to said rotatable annular member and to said grinding element, means for adjusting said grinding element relative to the end of said pipe, means for sliding said slidable frame to secure adjustment of the grinding element relative to the end of said pipe, and means grinding element on said rotatable frame, means for rotating said rotatable frame, and means for imparting rotation to said bevel grinding element while rotating said rotatable frame.

6. In a, machine for grinding the ends of pipe, a stationary frame, means for detachably securing said stationary frame in spaced relation to a pipe, a slidable frame adapted to slide within said stationary frame, an annular element mounted on the outer end of said slidable frame and carrying a driving element, a second annular member rotatably mounted on said first mentioned annular member and having a shaft journaled thereon, a driving element mounted on said shaft and secured thereto and engaging the driving element of the first mentioned annular member, a grinding element connected with said shaft for engagement with the end of said pipe, means for supplying power to said rotatable annular member and to said grinding element, means for adjusting said grinding element relative to the end of said pipe, means for sliding said slidable frame to secure adjustment of said grinding element relative to the end of said pipe, and means of adjusting the angular divergence of said shaft on which said grinding element is disposed comprising an adjustable screw element adapted to enswee -a segment element shaft. 11

In a machine wrram niean s :fo detachably. securing said frame about said pipe spaced relation" thereto,

i-nding element disposed on f the end of said frame {preparation upon the: end of 1 said pipe, means for driving said grinding element com: prising a motor, a V-shaped pulley on said motor, a complementary V-shaped frictional elementpaalshaftshaving;,saidslastementioned element mounted thereon for engagement ywithusaid -v,- shaped pulley, a second V-shaped pulley disposed on said shaft, a second V-shaped frictional element in engagement with said second V-shaped pulley, an annular ring having said second V- shaped frictional element circumferentially disposed therearound, a shaft mounted on said annular ring and carrying a third V-shaped pulley, a bevel grinding element connected with said last-mentioned shaft, a V-shaped friction element stationarily mounted on the frame and axially disposed with respect to said pipe, the last mentioned V-shaped pulley being in contact relation with said last-mentioned frictional element and connected with said last-mentioned shaft for driving the bevel grinding element, and means of adjustably moving said grinding element with respect to the end of said pipe.

8. In a machine for surfacing the end of a pipe, the combination of a frame, means for detachably securing said frame about the pipe and in spaced relation thereto, a grinding element for the end of the pipe, an annular ring mounted on the end of the frame and supporting the grinding elementthereon for operation, means for rotating said grinding element relative to the annular ring, and means for adjusting the position of the grinding element with respect to the end of the pipe.

9. In a machine for surfacing the end of a pipe, the combination of a frame, means for det'achably securing said frame about the pipe and in spaced relation thereto, a rotatable grinding element adapted to operate on the end of the pipe, an annular ring mounted on an end of the frame, a shaft journaled on the annular ring and supporting the grinding elementthereon, means for driving said grinding element, and means for adjusting the position of the grinding element relative to the end of the pipe.

10. In a machine for surfacing the end of a pipe, the combination of a frame, means for detachably securing said frame about the pipe and in spaced relation thereto, a rotatable grinding element adapted to operate on the end of the pipe, an annular ring mounted on an end of the frame, a shaft journaled on the annular ring and supporting the grinding element thereon, means for driving said grinding element including a motor and means forming a frictional driving connection between the motor and the shaft, and

means for adjusting the position of the grinding element on the shaft relative to the end of the P pe.

11. In a machine for surfacing the end of a pipe, the combination of a frame, means for detachably securing said frame on the pipe, an annular ring mounted on the frame, a shaft extending transversely across the ring and journaled thereon for operating movement, and a flexible element mounted on the shaft in position to act on the end of the pipe to produce a cleaning action thereon.

12. In a machine for surfacing the end of a for surfacing the ends of pipe,

pipe, the combination of a frame, means for detachably securing said frame on the pipe, an annular' ring mounted on the frame, a shaft extending approximatelyradially-of the ring and journaled thereon, an abrading element mounted on the shaftin position to act on the end of the pipe, and power means for operating said shaft;-

.v OLL R.

REFERENCES CITED The following references are of record in the file of this patent:

Nhmber UNITED" STATES PATENTS Name .7 Date Lyne Mar; 31, 1931 Brown Sept. 7, 1937 McQuade J an. 30, 1940 Greenwood Oct. 15, 1940 Rohrdanz' Sept. 29, 1942 Berezny Dec. 5, 1944 

